According to BD (i.e. I have no personal experience), BD Gold members can get in to the Virgin Clubhouse in T3 of LHR with a valid, same day ticket on VS. [Actually, that is a qualification of what I posted above - i.e, the access only seems to be at LHR, not to 'all clubhouses' as I implied in my earlier post]. However, I don't really understand your concern . Since VS give lounge access to UK Amex Plats, they can hardly claim to be concerned about exclusivity. Moreover, given that BD and VS don't actually compete on any routes, the decision may not be without commercial merit (in terms of attracting BD ff's to long haul VS flights).
[This message has been edited by james (edited 02-18-2001).]